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Water-wheel Governor.


decreases, the balls fall and put D in gear, thus turning G oppo-
sitely, and partly opening the sluice. The governor is driven
from the water-wheel by a belt.

The Undershot Wheel is shewn in Fig. 707. The form of
float has been drawn at Fig. 703, and there only remains to add
that, with Poncelet's improvements in floats and race, the water